Re: [xsl] Why doesn't <xsl:copy> copy xmlns=""?

[Michael Kay <mike@xxxxxxxxxxxx>]

If the xmlns="" appears on the outermost element then the XDM data model 
is indistinguishable from one in which the xmlns="" is absent - so the 
XSLT processor doesn't know it's there.

If it appears elsewhere the question gets terribly complicated: see

https://www.w3.org/Bugs/Public/show_bug.cgi?id=5857

Michael Kay
Saxonica


On 17/11/2012 13:39, Costello, Roger L. wrote:
> Hi Folks,
>
> I want to do an identity transform of this:
> ----------------------------------------------------------------------------
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
>             	       targetNamespace="http://www.bar.com";
>             	        xmlns:bar="http://www.bar.com";
>             	        xmlns=""
>             	        elementFormDefault="qualified">
>      
>      ...
>
> </xs:schema>
> ----------------------------------------------------------------------------
>
> Notice the default namespace declaration, xmlns=""
>
> Here is the code that I use to do the identity transform:
>
>      <xsl:template match="xs:schema">
>          <xsl:copy>
>              <xsl:copy-of select="@*" />
>              <xsl:sequence select="node() | comment() | processing-instruction()" />
>          </xsl:copy>
>      </xsl:template>
>
> (I use this code because I actually do more than just an identity transform, which I do not show here.)
>
> Here is the output from transforming the <xs:schema> with my code:
> ----------------------------------------------------------------------------
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
>             	       targetNamespace="http://www.bar.com";
>             	        xmlns:bar="http://www.bar.com";
>             	        elementFormDefault="qualified">
>      
>      ...
>
> </xs:schema>
> ----------------------------------------------------------------------------
>
> Yikes!
>
> What happened to the default namespace declaration?
>
> Questions:
>
> 1. Why is my code not copying over the default namespace declaration?
>
> 2. What change can I make to my code to ensure that it copies over the default namespace declaration?
>
> /Roger